Skip to main content Accessibility help

Effect of nitrogen fertilizer and landscape position on wild oat (Avena fatua) interference in spring wheat

  • Delaney M. Ross (a1) and Rene C. Van Acker


Site-specific fertilizer application is of primary interest among those investigating site-specific crop management. Site-specific soil moisture levels may be associated with the relative success of certain weed species, and weed competition can be affected by fertilizer application. A field study was conducted to investigate how landscape position–based site-specific nitrogen fertilizer application would influence wild oat interference in spring wheat. Wild oat was allowed to grow in spring wheat at foot and knoll landscape positions in the presence or absence of 80 to 90 kg ha−1 of spring preseed broadcast nitrogen fertilizer. In all three site–years of the study, landscape position did not affect wild oat competitiveness in wheat or relative wild oat biomass, and there were no significant landscape position by nitrogen fertilizer interactions for these variables. The lack of landscape position effect may be attributed to the lack of substantive differences in soil characteristics between landscape positions at the sites used in this study and to normal to above-average seasonal precipitation levels in all three site–years. Wild oat competitiveness in wheat was significantly greater in the presence of nitrogen fertilizer for all three site–years. The results of this study suggest that, when there are not great differences in typical soil characteristics between landscape positions and precipitation levels are normal or above normal, landscape-based site-specific nitrogen fertilizer application does not affect wild oat competitiveness in spring wheat, but preseed spring broadcast nitrogen fertilizer does make wild oat more competitive in spring wheat.


Corresponding author

Corresponding author. Department of Plant Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada;


Hide All
Blackshaw, R. E., Molnar, L. J., and Janzen, H. H. 2004. Nitrogen fertilizer timing and application method affect weed growth and competition with spring wheat. Weed Sci 52:614622.
Blackshaw, R. E., Semach, G., and Janzen, H. H. 2002. Fertilizer application method affects nitrogen uptake in weeds and wheat. Weed Sci 50:634641.
Bruce, R. R., Snyder, W. M., White, A. W. Jr., Thomas, A. W., and Langdale, G. W. 1990. Soil variables and interactions affecting prediction of crop yield pattern. Soil Sci. Soc. Am. J 54:494501.
Callow, K. A., Derksen, D. A., Grant, C. A., and Van Acker, R. C. 1999. The impact of monoammonium phosphate and potassium chloride on wild oat (Avena fatua L.) competition in zero-till spring wheat and flax. Pages 5759 in 21st Annual Manitoba-North Dakota Zero Tillage Workshop, Brandon, MB, Canada. Brandon, MB, Canada: Manitoba-North Dakota Zero-tillage Association.
Carlson, H. L. and Hill, J. E. 1985. Wild oat (Avena fatua) competition with spring wheat: effects of nitrogen fertilization. Weed Sci 34:2933.
Cousens, R. 1985. A simple model relating yield loss to weed density. Ann. Appl. Biol 107:239252.
Derksen, D. A., Anderson, R. L., Blackshaw, R. E., and Maxwell, B. 2002. Weed dynamics and management strategies for cropping systems in the Northern Great Plains. Agron. J 94:174185.
Di Tomaso, J. M. 1995. Approaches for improving crop competitiveness through the manipulation of fertilization strategies. Weed Sci 43:491497.
Jones, A. J., Mielke, L. N., Bartles, C. A., and Miller, C. A. 1989. Relationship of landscape position and properties to crop production. J. Soil Water Conserv 44:328332.
Manitoba Agriculture Food and Rural Initiatives. 2005. Seed Manitoba. Carman, MB, Canada: Manitoba Agriculture Food and Rural Initiatives, p. 23.
Manning, G., Fuller, L. G., Eilers, R. G., and Florinsky, I. 2001a. Topographic influence on the variability of soil properties within an undulating Manitoba landscape. Can. J. Soil Sci 81:439447.
Manning, G., Fuller, L. G., Eilers, R. G., and Florinsky, I. 2001b. Soil moisture and nutrient variation within an undulating Manitoba landscape. Can. J. Soil Sci 81:449458.
Manning, G., Fuller, L. G., Flaten, D. N., and Eilers, R. G. 2001c. Wheat yield and grain protein variation within an undulating Manitoba landscape. Can. J. Soil Sci 81:459467.
McConkey, B. G., Ulrich, D. J., and Dyck, F. B. 1997. Slope position and subsoiling effects on soil water and spring wheat yield. Can. J. Soil Sci 77:8390.
Mills, G. F. and Haluschak, P. 1993. Canada-Manitoba Soil Survey: Soils of the Carman Research Station N1/2 23 6–5W Special Report Ser. 93-1. Winnipeg, MB, Canada: Manitoba Soil Survey Unit, Department of Soil Science, University of Manitoba.
Pavlychenko, T. K. and Harrington, J. B. 1935. Root development of weeds and crops in competition under dry farming. Sci. Agric 16:151160.
Ross, D. 2001. Effect of Nitrogen Rate and Weed Density on Spring Wheat Yield at Two Landscape Positions. . University of Manitoba, Winnipeg, MB, Canada. 179 p.
Ruhe, R. V. 1960. Elements of the soil landscape. 7th Trans. Int. Congr. Soil Sci 4:165170.
Seefeldt, S. S., Jensen, J. E., and Fuerst, E. P. 1995. Log-logistic analysis of herbicide dose-response relationships. Weed Technol 9:218227.
Sexsmith, J. J. and Pittman, U. J. 1962. Effect of nitrogen fertilizers on germination and stand of wild oats. Weeds 11:99101.
Sharma, M. P. and Vanden Born, W. H. 1978. The Biology of Canadian Weeds. 27. Avena fatua L. Can. J. Plant Sci 58:141157.
Thomas, A. G., Leeson, J. Y., and Van Acker, R. C. 1999. Farm Management Practices in Manitoba. 1997 Manitoba Weed Survey Questionnaire Results. Agriculture and Agri-Food Canada Weed Survey Ser. 99-3. Saskatoon, Saskatchewan, Canada: Agriculture and Agri-Food Canada. 297 p.
Van Acker, R. C., Thomas, A. G., Leeson, J. Y., Knezevic, S. Z., and Frick, B. L. 2000. 1997 weed survey of cereal and oilseed crops in Manitoba. Can. J. Plant Sci 80:963972.



Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed